textproduct: Quad Cities

KEY MESSAGES

- Beautiful late summer weather continues through today.

- Gradual warming trend begins this weekend and continues next week along with increasing humidity.

- Active weather for parts of the area next week with periodic chances for showers and storms.

SHORT TERM /THROUGH SATURDAY/

Issued at 110 AM CDT Fri Aug 28 2026

High pressure is forecast to push to the east of the area today with quiet weathering continuing today with warm temperatures and low dewpoints. Temperatures will moderate across the area today with widespread high temperatures in the lower to mid 80s.

Shortwave trough is expected to begin to flatten ridge to our west tonight as a lead impulse moves into Minnesota and Wisconsin tonight into Saturday. Models show the low level jet veering into the area with the terminus to our north after 12 UTC Saturday with a potential decaying thunderstorm and shower complex moving across southern Minnesota and northern Iowa. Decided to keep chances for showers and thunderstorms in the forecast mainly north of Interstate 80 during the day on Saturday. Expect rainfall amounts to be light with lots of dry air in place with most locations seeing less than a tenth of an inch of rain. Severe thunderstorms are not expected with limited CAPE across the area Saturday morning. High temperatures on Saturday due to cloud cover have cooled by a couple of degrees and range form 79 to 84 degrees.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/

Issued at 110 AM CDT Fri Aug 28 2026

Upper ridge over the central CONUS to break down Saturday, as a strong upper low arrives onshore in the Pacific Northwest. A few lead shortwaves will round the top of the flattening ridge and moving eastward providing us with increasing temperatures, humidity levels, and precipitation chances late this weekend through next week. Recent model trends show the main storm track remaining to our northwest over the upper Midwest which would keep us warm and dry for the rest of August. For now, will stick with NBM slight chance/chance PoPs Sunday and Monday, but am inclined these will be removed in later forecasts.

Sunday onward, there is higher confidence of building heat and humidity with 594 dam upper high centered over southern Missouri. 850 mb temps are progged to rise into the 21-25C range and combined with dewpints in the upper 60s/low 70s will result in highs in the upper 80s/low 90s and heat indices approaching 100 degrees at times through Thursday. NBM probabilities of 70+ degree dewpoints continue to range from 50-80% Sunday through Thursday. In addition, the latest CPC 6-10 day temperature outlook has 90% or higher combined probabilities of near/above normal temperatures for the Sept 1st-5th timeframe. It looks like late summer heat will arrive prior to the Labor Day weekend. However, as noted by the previous shift there remains a large temperature spread in high temps (6-9 degrees) next week due to the strength and placement of upper ridge and any precip chances. For this reason, capped highs to remain under 93 degrees and left the daily PoPs from the NBM alone. Depending on when the upper ridge slides east or retrogrades westward will be key when we see precip chances and any relief from the heat as well as any severe risk. With large model variability, it is hard to pin this down at this time range.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

Issued at 615 AM CDT Fri Aug 28 2026

Beautiful weather is expected today with high pressure overhead leading to clear skies and light winds; VFR will prevail today into tonight.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.